Noctilucent Clouds Quiz

What makes noctilucent clouds distinct from other types of clouds?

• They are made of water vapor.

• They glow faintly at night.

• They are the lowest clouds in the atmosphere.

• They are only visible during winter.

During which months and at what latitudes are noctilucent clouds typically visible?

• Autumn months, 70 to 90 degrees latitude

• Winter months, 30 to 50 degrees latitude

• Summer months, 50 to 70 degrees latitude

• Spring months, 10 to 30 degrees latitude

What is a necessary condition for noctilucent clouds to appear to glow?

• The clouds must be at a low altitude.

• The sun must be just below the horizon.

• The clouds must be made of water vapor.

• The sun must be directly overhead.

What are noctilucent clouds primarily composed of?

• Water droplets

• Volcanic ash

• Dust particles

• Ice crystals

How can human activity contribute to the formation of noctilucent clouds?

• Through deforestation

• By increasing global temperatures

• By launching rockets into space

• Through the emission of greenhouse gases